Wonderwall

Gwen and Gavin smooch onstage

Gwen Stefani and Gavin Rossdale proved that rumors of a rift in their relationship are just that -- rumors! -- during a very public display of affection over the weekend on the main stage at Los Angeles radio station KROQ's annual Almost Acoustic Christmas, the same fest where the rockers met as up-and-coming stars 17 years ago.

Rumors of infidelity have plagued the parents of two since suggestive photos of Gavin and his boys' "nanny" circulated on the Internet in late November. Gavin's hand appeared to be placed familiarly on a Stefani-recalling platinum blonde's behind, but the mystery woman turned out to be Gavin's sister, Soraya (ew?).

Gavin dashed any lingering questions about his fidelity when he declared his commitment to his wife during a performance with his band Bush at Almost Acoustic on Dec. 8. Halfway through "Glycerine," Gwen joined her husband onstage for a surprise duet. As the song concluded to wild applause, the couple shared a sweet smooch.

"I thought it would be so powerful, the two of us onstage like that, that's what we went for," Gavin told Rolling Stone of his decision to perform with his wife. "This is the culmination of two years of work, and then to finish it off playing here, in this venue, this full circle thing, it was an incredible night."

The next day on Dec. 9, Gavin repaid the favor when he returned for the second night of KROQ's annual bash to support No Doubt during their surprise set. He kept a low profile, hanging out backstage in No Doubt's dressing room before their set. He then followed Gwen and her bandmates through a secret backstage door leading to the stage, where he proudly watched their performance from the sidelines.

More recently, they were spotted at Disneyland's California Adventure on Tuesday afternoon with a group that included their sons and Gavin's sister. A WW source spotted them stopping for pretzels near the Hollywood Tower of Terror as they pushed their boys in strollers.

Keep clicking to see more photos of Gwen and Gavin at Almost Acoustic Christmas ...